Toomuchtosay

Hello, as the title explains I was accepted into the program, but am on a waiting list for an assistantship. My only career goals is to teach at the university level, so I am planning on going to graduate school at some point. However, the only consistent advice that I have been given is that you shouldn't go to graduate school if they don't fund you because they aren't really accepting you. I also just don't have the means or the the motivation to get into more debt for a career I want but that pays little. I am told I am "high" on the list. The director said she would keep me up to date if anything changes. If by the Fall of 2019 I do not have funding is there a way to push my starting semester until I get funding? I am graduating undergrad this semester, so maybe that played a part in the lack of assistantship offers. Any help would be lovely, and with advanced thanks.